Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/lib/Kconfig.kmemcheck

  1 config HAVE_ARCH_KMEMCHECK
  2         bool
  3 
  4 if HAVE_ARCH_KMEMCHECK
  5 
  6 menuconfig KMEMCHECK
  7         bool "kmemcheck: trap use of uninitialized memory"
  8         depends on DEBUG_KERNEL
  9         depends on !X86_USE_3DNOW
 10         depends on SLUB || SLAB
 11         depends on !CC_OPTIMIZE_FOR_SIZE
 12         depends on !FUNCTION_TRACER
 13         select FRAME_POINTER
 14         select STACKTRACE
 15         default n
 16         help
 17           This option enables tracing of dynamically allocated kernel memory
 18           to see if memory is used before it has been given an initial value.
 19           Be aware that this requires half of your memory for bookkeeping and
 20           will insert extra code at *every* read and write to tracked memory
 21           thus slow down the kernel code (but user code is unaffected).
 22 
 23           The kernel may be started with kmemcheck=0 or kmemcheck=1 to disable
 24           or enable kmemcheck at boot-time. If the kernel is started with
 25           kmemcheck=0, the large memory and CPU overhead is not incurred.
 26 
 27 choice
 28         prompt "kmemcheck: default mode at boot"
 29         depends on KMEMCHECK
 30         default KMEMCHECK_ONESHOT_BY_DEFAULT
 31         help
 32           This option controls the default behaviour of kmemcheck when the
 33           kernel boots and no kmemcheck= parameter is given.
 34 
 35 config KMEMCHECK_DISABLED_BY_DEFAULT
 36         bool "disabled"
 37         depends on KMEMCHECK
 38 
 39 config KMEMCHECK_ENABLED_BY_DEFAULT
 40         bool "enabled"
 41         depends on KMEMCHECK
 42 
 43 config KMEMCHECK_ONESHOT_BY_DEFAULT
 44         bool "one-shot"
 45         depends on KMEMCHECK
 46         help
 47           In one-shot mode, only the first error detected is reported before
 48           kmemcheck is disabled.
 49 
 50 endchoice
 51 
 52 config KMEMCHECK_QUEUE_SIZE
 53         int "kmemcheck: error queue size"
 54         depends on KMEMCHECK
 55         default 64
 56         help
 57           Select the maximum number of errors to store in the queue. Since
 58           errors can occur virtually anywhere and in any context, we need a
 59           temporary storage area which is guarantueed not to generate any
 60           other faults. The queue will be emptied as soon as a tasklet may
 61           be scheduled. If the queue is full, new error reports will be
 62           lost.
 63 
 64 config KMEMCHECK_SHADOW_COPY_SHIFT
 65         int "kmemcheck: shadow copy size (5 => 32 bytes, 6 => 64 bytes)"
 66         depends on KMEMCHECK
 67         range 2 8
 68         default 5
 69         help
 70           Select the number of shadow bytes to save along with each entry of
 71           the queue. These bytes indicate what parts of an allocation are
 72           initialized, uninitialized, etc. and will be displayed when an
 73           error is detected to help the debugging of a particular problem.
 74 
 75 config KMEMCHECK_PARTIAL_OK
 76         bool "kmemcheck: allow partially uninitialized memory"
 77         depends on KMEMCHECK
 78         default y
 79         help
 80           This option works around certain GCC optimizations that produce
 81           32-bit reads from 16-bit variables where the upper 16 bits are
 82           thrown away afterwards. This may of course also hide some real
 83           bugs.
 84 
 85 config KMEMCHECK_BITOPS_OK
 86         bool "kmemcheck: allow bit-field manipulation"
 87         depends on KMEMCHECK
 88         default n
 89         help
 90           This option silences warnings that would be generated for bit-field
 91           accesses where not all the bits are initialized at the same time.
 92           This may also hide some real bugs.
 93 
 94 endif

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us